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Finding the Fourth Proportional to 248.39, 372.61 and 86.08

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Solution

The fourth proportional to 248.39, 372.61 and 86.08 is: 129.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.39 : 372.61 = 86.08 : x
  2. Step 2: Convert to fraction form
    248.39/372.61 = 86.08/x
  3. Step 3: Cross multiply
    248.39x = 372.61 × 86.08
  4. Step 4: Simplify right side
    248.39x = 32,071.98
  5. Step 5: Solve for x
    x = 32,071.98/248.39
  6. Step 6: Final answer
    x = 129.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.